On a glyph set up I have, 20 levels across 5 glyphs is an extra 6% to my damage multiplier, I think 2% to my crit damage muliplier, and I think an additional 2.4% to my vulnerable multiplier.
Base effects, one of those glyphs will noticeably increase my golem damage, another crit, another vulnerable.
Maybe you don’t want to call that “huge” but it’s definitely noticeable.